Hydrochloric Acid → HCID 66880761, compound

Participants

Reaction Steps

A solution of 7 g (34 mmol) of 1-(4-amino-3-fluoro-phenyl)-1H-pyridin-2-one (prepared according to C. F. Bigge et al., patent application WO 2003045912) in 25 ml of THF was cooled to −78° C. and treated dropwise with 41 ml of a 1M lithium bis(trimethylsilyl)amide-solution in THF and stirred for 30 min. To this solution 9.5 g (32 mmol) of (1RS, 5SR, 6R)-3-(4-chloro-phenyl)-2,4-dioxo-3-aza-bicyclo[3.1.0]hexane-6-carboxylic acid ethyl ester were added portionwise and the mixture was allowed to reach room temperature within a few hours. The mixture was then poured into a diluted aqueous HCl-solution (ca. 0.2 M) and extracted with AcOEt. The combined organic phases were dried with Na2SO4. Evaporation of the solvent and chromatography on silica gel with dichloromethane and then with a gradient of dichloromethane/MeOH from 98:2 to 95:5 gave 4.1 g (24%) of the title compound. Light brown solid. MS: 496 (M−H)−.

Provenance & Evidence